Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 12

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Weekly Quiz Competition

Question 1
4 / -1

X-rays are used in determining the molecular structure of crystalline because its

A
energy is high

B
it can penetrate the material

C
its wavelength is comparable to interatomic distance

D
its frequency is low
Question 2
4 / -1

The minimum wavelength of X-rays emitted from X-rays machine operating at an accelerating potential of V volts is

A

B

C

D
Question 3
4 / -1

K_α wavelength emitted by an atom of atomic number Z = 11 is λ. Find the atomic number for an atom that emits K_α radiation with wavelength 4λ

A
Z = 6

B
Z = 4

C
Z = 11

D
Z = 44
Question 4
4 / -1

The radiation corresponding to 3 → 2 transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of 3 × 10^-4 T. If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to

A
1.8 eV

B
1.1 eV

C
0.8 eV

D
1.6 eV
Question 5
4 / -1

A
h

B
e

C

D
Question 6
4 / -1

Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 nm is incident on it a potential of 7.7 V is required to stop the photoelectrons from reaching the collector plate. How much potential will he required to stop photoelectrons, when light of wavelength 200 nm is incident on it?

A
15.4 V

B
2.35 V

C
3.85 V

D
1.5 V
Question 7
4 / -1

The ionisation energy of hydrogen is 13.6 eV. The energy of the photon released when an electron jumps from the first excited state (n = 2) to the ground state of a hydrogen atom is

A
3.4 eV

B
4.53 eV

C
10.2 eV

D
13.6 eV
Question 8
4 / -1

What is the ratio of wavelength of a photon and that of an electron (of mass, m) of the same energy (E)?

A

B

C

D
Question 9
4 / -1

A monochromatic light of frequency 3 × 10¹⁴ Hz, is produced by a laser, emits the power of 3 × 10^-3 W. Find, how many number of photons are emitted per sec?

A
1.5 × 10¹⁶

B
2.5 × 10¹⁶

C
4.5 × 10¹⁶

D
8.5 × 10¹⁶
Question 10
4 / -1

In a photoelectric effect measurement, the stopping potential for a given metal is found to be V₀ volt, when radiation of wavelength is used. If radiation of wavelength 2λ₀ is used with the same metal, then the stopping potential (in volt) will be

A

B
2V₀

C

D